必 means 'certainly'

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Strokes : 5    Frequency: 283   JLPT: N3    Usefulness: 3    Challenge set: 3    Grade: 4   Intermediate lesson: 20    Beginner lesson: -   Begins 70 words   Used in 91 words   Used in 9 names   Component in 7 kanji (4 Jōyō)
Jōyō (常用)
   かなら certainly, invariably
⿻   heart   () katakana 'no'; whereupon; splitting away from  
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In the most useful 10,000 words in Japanese, 必 is used 8 times, read 2 ways (with 1 variation).
Across all words in Japanese, 必 is used 89 times, read 2 ways (with 1 variation).
ヒツ (read as ひっ) : 44 words FIND ALL
1. frantic; desperate
2. inevitable death
(click the word to view an additional 1 meaning)
ヒツ : 39 words FIND ALL
1. necessary; needed; essential; indispensable  (必用 can imply has to be used rather than is just needed)
2. necessity; need; requirement
(click the word to view an additional 2 forms)
かなら : 6 words FIND ALL
always; without exception; necessarily; certainly; without fail; positively; invariably
Henshall: 597 (originally: 568)  Joy o' Kanji : 568  Key to Kanji: 896 

Cascading kanji view

ヒツ   かなら certainly, invariably   
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katakana 'no'; whereupon; splitting away from   
シン   こころ heart   
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